ASME B16 12:2019 pdf download.Cast lron Threaded Drainage Fittings.
ASME B16 12 for cast iron threaded drainage fittings covers
(a) sizes and method of designating openings in reducing fittings
(b) marking
(c) material
(d) dimensions and tolerances
(e) threading
(1) ribs
(g) coatings
(h) face bevel
1.2 AppLicabiLity
This Standard covers fittings intended for use in gravity drainage systems subject only to the gravity head of waste liquids at temperatures from ambient to approximately 100°C (2 12°F). The use of this Standard for pressurized waste handling systems is the responsibility of the user and is subject to the requirements of any applicable code.
1.3 QuaLity Systems
Requirements relating to the product manufacturers’ Quality System Programs are described in Nonmandatory Appendix A.
1.4 References
Standards and specifications adopted by reference in this Standard are shown in Mandatory Appendix 1, which is part of this Standard. It is not considered practical to identify the specific edition of each referenced standard and specification in the text, when referenced. Instead, the specific editions of the referenced standards and specifications are listed in Mandatory Appendix I.
2 SIZE
2.1 NominaL Pipe Size
The size of the fittings scheduled in Tables 2.1-1 and 2.1-2 is identified by the corresponding nominal pipe size (NPS). For reducing tees, Y-branches, or crosses, the largest run opening shall be given first. The straight-line sketches (Figure 2.1-1) illustrate how the reducing fittings are read.
5.2 MetaL Thickness
At no point in the castings shall the metal thickness be less than 90% of the values listed in Table 4.1-1.
5.3 Thread Chamber
The length of thread and total length of thread chamber to shoulder shall not vary from the dimensions shown in the tables by more than plus or minus the equivalent of the pitch of one thread.
5.4 Outside Diameter and Width of Band
The minus tolerances given in Table 2.1-1 are permitted on inspection to apply to the diameter of the band and the width of the band.
5.5 Inside Diameter of Fitting
The inside diameter shall not vary from dimensions shown by more than the following:
(a) ±0.8 mm (0.03 in.) for NPS 1/2 to 4, inclusive
(b) ±1.6 mm (0.06 in.) for NPS 5 to 8, inclusive
5.6 Center-to-End
The center-to-end dimensions shall not vary from the given dimensions by more than the values given in Table 2.1-2.ASME B16 12 pdf download.